The script desaturates the original layer and adds a sepia mask in a layer above.
The sepia mask layer has a mask which is the inverted desaturated original.

"With Hue": With hue modification of the original image.

The script desaturates the original layer by a given value and changes its hue.
It adds a sepia mask in a layer above.
The sepia mask layer has a mask which is the inverted desaturated original.
As blend modes "Color" or "Hue" can be used.

Note: "With Hue" with hue=0, desaturation=100 and blend mode="color" is equivalent to "Classic".